Unit 6 Creating Digital Graphics By Olivia Attree

Unit 6 - Creating Digital Graphics By Olivia Attree

Types of graphics. • • • Different types of Graphics Include: Bitmap Jpeg Vector Gif

Bitmap • Bitmap: A bitmap is a map of dots, or bits (hence the name), that looks like a picture as long you are sitting a reasonable distance away from the screen.

JPEG • Jpeg: is a commonly used method of lossy compression for digital photography (i. e. images). The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality.

Vector • Vector: Vector graphics is the use of geometrical primitives such as points, lines, curves, and shapes or polygon, which are all based on mathematical expressions, to represent images in computer graphics.

Gif • Gif: GIF supports colour and various resolutions. It also includes data compression, but because it is limited to 256 colours, it is more effective for scanned images such as illustrations rather than colour photos.

Why would you use them? • Bitmap: When you take a photograph using a digital camera or scan an image from a magazine, you are creating a bitmap graphic. • Jpeg: When you want to compress an image so the file size is small. • Vector: if you want to resize something but not lose its quality. • Gif: GIF is good for saving images with flat blocks of colour such as logos or simple illustrations

Sizes and resolution • Bitmap: Bitmaps are resolution-dependent • Jpeg: supports 8 -bit greyscale images and 24 -bit colour images • Gif: is limited to an 8 -bit palette • Vector: can be rendered smoothly at any desired display size.

What are the differences between vector and bitmap? • These are the main differences between vector and bitmap

A few questions answered • Photo shopping is when an image has been altered in some way , eg colour change , skin smoothing or pasting images on top of each other. • Black and white would work on some images because it can take advantage of different tones and lighting to present the image in greyscale. • Image size is the resolution, and image quality is how the picture looks eg pixelated etc